Combined drill and valve grinder



P. MAcKENZIE.

COMBINED DRILL AND VALVE GRINDER. APPLICATION FILED JUNE 30. 1920.

Patented Aug. 8, 1922.

2 SHEETS-SHEET I- -11v VENTOR 1 /251140 Maclfeiye 1 4TTORNEY P.MACKENZIE. COMBINED DRILL AND VALVE GRINDER.

APPLICATION FILED JUNE 30, I920.

Patented Aug. 8, 1922.

2 SHEETSSHEET 2.

ATTORNEY UNiTEfi STATES PHILIP MACKENZIE, OF SAN FRANCISCO, CALIFORNIA.

COMBINED DRILL AND VALVE GRINDER.

Application filed June 30,

This invention relates to a combined drill and valve grinder and has forits object to provide in a single unitary structure means for.continuously rotating a chuck whereby to adapt the device for ordinarydrilling purposes and also to provide means for imparting an oscillatingaction to the,

chuck whereby to adapt the device for use 111 grmdmg valves.

The device in its present form lncludes a motor or engine preferably ofthe small portable type which, through a train of speed increasinggearing rotates a chuck continuously in one direction in the manner ofthe usual type of drills. A shiftable gear is included in said train andis adapted to connectv with a second train of gears which latterincludes a pair of reciprocating pawls alternately meshing with agearfor imparting oscillating movement to the chuck. Also in connection withthe reciprocating pawls, I provide means for imp'arting an additionalmovement'to the chuck in one direction so that the latter will beadvanced a slight distance, each oscillation for the purpose ofprogressively turning the valve in its seat so as to insure evenness ofgrinding.

One form which my invention may assume is exemplified in the followingdescription and illustrated in the accompanying drawings, in which: a a

Fig. 1 shows a side elevation partly in section of a device embodying myinvention.

Fig. 2 shows a circumferential sectional view of the housing andenclosed gears.

Figs. 3, 4, and 5 show details of the reciprocating mechanism in variouspositions of movement.

Referring more in-detail to the accompanying drawings, I show a casinglO'which contains a motor, the shaft ,11' of which motor carries apinion l2 meshing with a gear 13 on a shaft 14, the latter beingsupported in a housing 15 detachably secured to oneend of the casing 10.On the shaft 14 is a slidable pinion 16 adapted to mesh when in oneposition with a gear 18 fixed Specification'of Letters Patent.

, Patented Augu851922. 1920. Serial No. 393,021.

upon the spindle 17 of a chuck 19. Through the gearing just described,the motor'will thus operate the chuck continuously in one direction fordrilling and similar purposes.

In its other position this vshiftable pinion 16 meshes with a gear 20supported on an axle 21. arranged within the housing 15. This gear 20carriesa crank arm 22 to which is connected by means of a wrist pin 23an arm 24 having at its outer end a segmental gear 25 toco-operate'withthegear 18 on the chuck spindle. A second arm 26 similar to the arm 24is eccentrically pivoted at 27 to the-wrist pin, 23. This arm 26 has asegmental gearor pawl teeth 28 to cooperate with the gear 18, said gear18 being made extra wide for this purpose. The' opposite end of thearm26 projects beyond the eccentric mounting and has a pin 29 working ina slot formedin the correspond,

ing end of the arm 24. .A spring 30 connects with the arm 26 and in turnto the housing 15 and is arranged to exert a'pull uponsaid arm in adirection to cause it to move towards the gear 18. Having regard to theposition of the parts shown in Figs. 2' and 5 inclusive, it will benoted that on the down stroke of the arm 26 the teeth on said arm willbe pulled-into engagement with the gear 18 and thereb the gear 18 willbe moved to the left. When arms 24 and 26. On the upward movement ofsaid arms, the teeth 25 will cause'the gear 18 to be turned to theright, but the length of movement of the arm 24 being less than that ofthe arm 26, the movement of the gear 28 to the right will be lessthanits movement to the left. The reason for this is found in the fact thatthe length of movement of the arm 26 is increased by the eccentricmounting. The result of this is that the gear 18 will he stepped aheadin one direction one or more teeth at the end of each cycle of'movementof the reciprocating arms 24 andv 26 and in consequence thereof thechuck will be progressively stepped ahead so as to insure even grindingof the valve within its seat.

In order that the segmental gears 25 and 28 may be thrown out of meshwith the gear 18 when the deviceistbe ng-used as a rotary drill, Iprovide a guide rod 31 formed in a curve struck from the centerofthegear.18.- Co-operating with said guide rod is a pin 32; fixed uponlthearm 2l and normally dis-c posed at the outer side thereof. The guide rod31 is carried by a turnable support33 within the housing and saidsupport is controlled by a lever and detent' mechanism 3 1 disposed atthe exteriorof the housing.

turningithe averse, the, guide rod31 will bejinovedin direction to shiftthe segmental gears out of mesh with the gear '18,

Fdr shiftingthe gear 16,1 provide a shift b 35 arrangi mm a oint outsidethe housing along the bearing r011- chuck or vice versagthegear isshifted to the deQ spindletoa oint within the housing where itcOiinectswith shift arm 36 lying within a groove 3,7 formed the hub ofthe "shiftable gear 16L When it is desired to convert the device from arotary drill to a valve grinder siredg fposition by the mechanism 'justdescribed. I V I The eccentricmoveinent of the pivot on which the pawlarm 26 "is journaled"will.

rr he, hert en of an paw armi wlardlywtowards the spur gear 18 on thedown nake and therefore the, corresponding end of thepawl arm24 willbemoved in wardly 'resulting in the disengagementjof the segmehtalvear25am thespfur gear 18 When the cran; arin starts its upwardimove ment,the eccentrically arranged, pivot 27 will move away from the spur gear18threbycarrying thegshort endof the pawl arm,

26with it. To perrr it this movement, however, ftha corresponding end ofthe pawl arm will have to move in unison there with and such movement ofthis end of the said armQ l will cause theopposite end of the said arm'24 to move into engagement with the spurgear 18. The a, movement of theeccentric pivot 27 will be sufficient to carry the long end ofthe pawlarm, QQoutQ of engagementwith'thespur gear 18 even as causing the teeth28 to 'be disengaged" from the, spur, gear 18 a V o o Various changes inthe constmctionand arrangement of the several parts may be employedwithout departing from the spirit ofmy invention asdi sclosed theappended claims, f i l o Having thus described my, invention,-wh at Iclaim andldesire to ,secure by Letters Patent is :y

1;, In nrachi 5e 1 tool, a ,rotary driving element a chuclga spur gearon ther ohuck spindle a pair of reciprocating pawls alternately,engageable, with the spur gear for line parting oscillating moyernent vthereto, a spur gear, fordriving said pa wls, and a slidmg gearalternately engageable with said spurgears for transmitting continuousrotary motioni from the driving element to the chuck or oscillatingmovement from the driving, element to: said chuck.

2. In a'machine tool, a rotary driving element, a chuck, a spur gear onthe, chuck spindle, a pair of reciprocating pawls alternately engageahlewith the spur gear for imparting oscillating movement thereto, a spurgear for driving said pawls, a sliding gear alternately engageable withsaid spur gears for transmitting continuous rotary motion irom thedriving element to the member on. the chuck with which the pawlsengageandjmeansfor controlling the pawls to impart a progressive"oscillating movement, to the member on the chuck.

4. .In a maohineftool, a rotary driving element,.a chuck, a gear onthechuck spindle, a crank arm driven by the rotary driving element,a/pairof pawls mounted on the cranlqarm, and means. to causeone pawl toengage the gearduring one-half the cycle of movement of the crank armand the other pawl to en age the" gear during the; remaininghal of-"thecycle whereby to impart movement to thegear in opposite directions.

5. In a m'acjhinetool, a rotary driving element, a chuck, a gea non thechuck spindle, a crank arm, driven by the rotary driving element, a,pair of ,1:)awls mounted on the,

crank arm, and means to cause one, pawl to engage the gear duringone-half the cycle of movementof the crank arm and the other pawl toengage the gear during the remaining half of the cycle whereby to,impart IIIOYQIIlQIllltQ the gear in opposite directions, said pawlsbeingjconnected at difierent distances from the center of'the crankwhereby the movement imparted to' the gear, will be v equal n iipes te dre ions-I 6. In a machingtooha rotary driving element, a chuck,.ya gearon the chuck spindle, a V crank arm ,driven'by the rotary drivingelement a pair of arms pivotally mounted on the crank armat differentdistances from the center thereof, asegmen'tal gear on, each arm forco-action with said gear on the chuck spindle, and meansfto cause thesegmental garsjto alternately engage with'the gear on the, chuck spindlewhereby Y to iIn part unequal m oyements thereto in opposite gun,

directions. o y

7. Ina machinetool, a rotary driving ele;

ment, a chuck, a spur gear on the chuck spindle, a crank arm driven bysaid rotary driving element, a wrist pin on the crank arm, a pawlconcentrically mounted on the wrist pin, a second pawl eccentricallymounted on the wrist pin, and means to cause said pawls to alternatelyengage with the spur gear whereby to impart unequal movements thereto inopposite directions.

8. In a machine tool, a rotary driving element, :1 chuck, a spur gear onthe chuck spindle, a crank arm driven by said rotary driving element, awrist pin on the crank arm, a pawl concentrically mounted on the wristpin, a second pawl eccentrically mounted on the wrist pin, a springconnected with one of said pawls and acting to move the same towards thespur gear, and a sliding and pivotal connection between said pawlsacting in'conjunction with the eccentric mounting to cause the pawls toal ternately engage with the spur gear for imparting unequal movementsto the latter in opposite directions.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

PHILIP MAOKENZIE.

M. E. EWING.

